Compressor pump



Jan. 29, 1952 J. R. MANGAN COMPRESSOR PUMP Filed Oct. 20, 1948 mmvrox John R. Man cm flttorngg Patented Jan. 29, 1952 UNlTED STATES PATENT OFFICE COMPRESSOR PUMP John R. Mangan, La Crosse, Wis.

Application October 20, 1948, Serial No. 55,450

8 Claims. (Cl. 230206) This invention relates to a fluid-compressor unit, particularly of the gas-compression type utilized for refrigeration systems.

Heretofore, hermetically sealed gas-compressors of the type described have been provided with an electric motor therein for operating one or more gas-compression cylinders in cooperation with automatic valve means, and with pistons in the cylinders utilized for throwing oil from a bath thereof in the unit to lubricate various movable parts of the unit. The drag on the pistons within the oil bath, however, reduced the effective power of the pistons considerably or necessitated enlargement of the unit to off-set consequent loss of effective power compressing the gas.

One object of the present invention is to provide a fluid-compressor unit of the character described which utilizes an improved device for pumping lubricating oil from the bottom of the unit to movable parts in the upper portion thereof, without substantially reducing the effective power of the unit.

Another object of the invention is to provide a compressor unit of the character described, including an electric motor at the bottom of the unit and gas-compressing cylinder and piston means at the top thereof operated by the motor, wherein improved means is provided for efficiently metering out an adequate supply of lubricant to all parts of the cylinder and piston means, and thereby additionally sealing against leakage of gas-pressure past the piston to the interior of the casing.

Of the accompanying drawing:

Figure 1 is a vertical cross-section through a hermetically sealed fluid-compressor unit embodying the features of the invention.

Figure 2 is a fragmentary cross-section taken substantially on the line 2-2 of Figure 1.

Figure 3 is a cross-section taken substantially on the line 3-3 of Figure 1.

Referring to the drawing, the numeral Ill designates a compressor unit for installation in association with refrigeration apparatus not shown to supply agaseousrefrigerantunderpressure thereto. Unit l0 may comprise a hermetically-sealed, globular shaped casing having internally threaded bosses II on the underside thereof for bolting the casing to a base upon which other units not shown) of the apparatus are to be mounted. Journalled in inwardly projecting bosses l2 and I3 integrally formed in top and bottom wall portions l4 and I5, respectively, of the casing may be a rotor shaft l6 carrying an armature l1, arranged in the magnetic field of a stator l8 suitably mounted at I9 within the casing. The armature l1 and stator I8 constitute a motor to be driven by electricity from a suitable source (not shown).

The lower end of rotor shaft I6 is journalled in a bearing sleeve 2| mounted in the inner end of boss I3, and a short worm-threaded extension 22 of the shaft is snugly but rotatably received in a lower cylindrical chamber 23 withn the boss IS, the end of the extenson having an integral reduced portion 24 engaged against a thrust-receiving disc 25 at the bottom of the chamber. The threads of extension 22 may be of the square type for flat engagement with the surface of said cylindrical chamber, and an orifice 26 is provided in boss I3 to communicate the upper part of threaded extension 22 with a bath B of lubricating oil of substantial depth in the bottom of the casing ill, the oil flowing by gravity into chamber 23 by way of the spiral grooves defining the threads of the extension. The oil bath B preferably is of sufficient depth to lubricate the bearing surface of sleeve 2| by seepage thereto. Oil thus received at the upper end of screw extension 22 is adapted to be pumped downwardly by continued rotation of the screw in proper direction with rotor shaft l6, to build up a substantial pressure, toward the bottom of chamber 23, thereby to force the oil into said slot 26a at the lower end of the extension and upwardly along a passage 21 through the rotor shaft, the upper end of which opens into an oil-retaining chamber 28 in upper boss 12. The upper bearing for rotor shaft 16 is lubricated by oil seepage from the chamber 28.

A passage 28a or conduit from upper oil-filled chamber 28 extends angularly downwardly through a rib or enlargement integral with the wall portion 15 of casing l0, and opens at a point at or above a small orifice 29 in a gas-compression cylinder 30 mounted in the casing with its center line extending horizontally and normal to the vertical center line of the rotor shaft. A piston 3| is reciprocable in the cylinder as by means of an eccentric shaft 32 having a connection at one end to a wrist-pin 33, in a bore 33a through the piston, and a connection at the other end to an eccentric block 34 fixed on the rotor shaft I6. Oil continuously metered through the orifice 29 in the top of the cylinder is fed into an annular groove 35 in the piston, twice with each stroke thereof, to provide a constant film of oil between the piston and the cylinder which serves the dual purpose of lubricating the piston and sealing against loss of compressed refrigerant gas from automatic compressor valve means 36, of

known typeimounted on the casing in association I orifice in the bottom of the cylinder wall, as wellpiston and said rotatably driven member for reciprocating said piston, a cylindrical bottom as over the top of the cylinder, to drop back into the oil bath B.

A certain amount of oil from the cylinder 30 is received in the top of a wrist-pin bore 33a, to

seep through passages 38 in the pin communieating with an annular groove 39 on the periphery thereof, and then through a passage 4| in the eccentric shaft 32 to an annular groove 42 in the eccentric block 34 on the rotor shaft.

For counter-balancing the action of piston 3|, a counter-weight 43 is fixed on the rotor shaft l6, or an additional piston means, similar to that described above, may be mounted in the casing and eccentrically connected to the rotor shaft in opposite relation to eccentric shaft 32 and associated parts.

In operation of the apparatus described above for supplying gas under pressure to a refrigerating coil unit (not shown), motor M is continuously driven to rotate the rotor shaft l6, thereby throughsaid eccentric shaft 32 to reciprocate the piston 3| in cylinder 30 at relatively high speed. Reciprocation of the piston' pumps gas through the valve means 36 in known manner.

Rotation of rotor shaft I6, causes screw extension 22 to force oil from the oil bath B upwardly through passage 21 in the shaft, to keep the upper oil chamber 28 full of oil. Oil from chamber 28 is fed through passage 28a to orifice 29, in the upper wall of the cylinder, to be metered to the interior of cylinder 30 as previously described.

Modifications of the invention may be resorted to without departing from the spirit of the invention or the scope of the appended claims.

What is claimed is:

1. A compressor unit of the character described comprising a casing, power means within said casing including a member rotatably driven about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, a

mechanism on said casing above the liquid level of said bath and driven by said power means, a cylindrical bottom chamber in said casing below said liquid level, an upper chamber in said casing above said liquid level, a passage through said member communicating adjacent the upper and lower ends thereof with said upper and lower chambers respectively, inlet means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in said member, helical threads on the lower end of said member rotatable therewith within said bottom chamber in one direction by the power means to compress lubricating liquid received in the bottom chamber from said bath through said inlet means, said compression liquid thereby being forced upwardly through said passage and into said upper chamber, and conduit means for supplying lubricating liquid from said upper chamber to said mechanism.

2. A compressor unit of the character described comprising a casing, power means within said casing including a member rotatably driven about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, at least one gas-compression cylinder in said casing above said liquid level, a piston reciprocable in said cylinder, eccentric means connecting between said chamber in said casing below said liquid level, an upper chamber in said casing above said liquid level, a passage through said member communicating adjacent the upper and lower ends thereof with said upper and lower chambers respectively, inlet means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in said member, helical threads on the lower end of said member rotatable therewith within said bottom chamber in one direction by the power means to compress lubricating liquid received in the bottom chamber from said bath through said inlet means, said compression liquid thereby being forced upwardly through said passage and into said upper chamber, and conduit means for supplying lubrieating liquid from said upper chamber to said sion cylinder in said casing above said liquid level, a piston reciprocable in said cylinder, eccentric means connecting between said rotor shaft and said piston for reciprocating the same, a cylindrical bottom chamber in said casing below said liquid level, an upper chamber in said casing above said liquid level, a passage through said rotor shaft communicating adjacent the upper and lower ends thereof with said upper and lower chamber, respectively, inlet means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in the rotor shaft, helical threads on the lower end of said rotor shaft rotatable therewith within said bottom chamber by the motor in one direction being operable to compress liquid received in the bottom chamber through said inlet means, said compression liquid thereby being forced from said bath upwardly through said passage and into said upper chamber, and conduit means for supplying lubricating liquid from said upper chamber to said cylinder and piston.

4. A compressor unit of the character described comprising a hermetically sealed casing, an electric motor mounted in the bottom of said casing and including a rotor shaft journaled in the casing to be rotated about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, at least one fluid-compres- 'sion cylinder in said casing above said liquid level, a pistonireciprocable in said cylinder, eccentric means connecting between said rotor shaft and said piston for reciprocating the same, a bottom chamber in said casing below said liquid level, a screw extension on said rotor shaft rotatably received in said bottom chamber, an upper chamber in said casing above said liquid level, a passage through said rotor shaft communicating adjacent the upper and lower ends thereof with said upper and lower chambers, respectively, inlet means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in the rotor shaft, said screw extension upon rotation of said rotor shaft by the motor in one direction being operable to force liquid from said bath upwardly through said passage and into said upper chamber, and conduit means for supplying lubricating liquid from said upper chamber to said cylinder and piston, said conduit means including an aperture through the top of said cylinder and a passage from said upper chamber to adjacent said aperture, said piston having an annular groove in the outer periphery thereof for intermittent communication with said aperture as the piston is reciprocated.

5. A compressor unit of the character described comprising a hermetically sealed casing, an electric motor mounted in the bottom of said casing and including a rotor shaft journaled in the casing to be rotated about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, at least one fluid-compression cylinder in said casing above said liquid level, a piston reciprocable in said cylinder, eccentric means connecting between said rotor shaft and said piston for reciprocating the same, a bottom chamber in said casing below said liquid level, a screw extension on said rotor shaft rotatably received in said bottom chamber, an upper chamber in said casing above said liquid level, a passage through said rotor shaft communicating adjacent the upper and lower ends thereof with said upper and lower chambers, respectively, inlet means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in the rotor shaft, said screw extension upon rotation of said rotor shaft by the 'motor in one direction being operable to force liquid from said bath upwardly through said passage and into said upper chamber, and conduit means for supplying lubricating liquid from said upper chamber to said cylinder and piston, said conduit means including an aperture through the top of said cylinder and a passage from said upper chamber to adjacent said aperture, said piston having an annular groove in the outer periphery thereof for intermittent communication with said aperture as the piston is reciprocated, said eccentric connecting means comprising an eccentric bearing fixed on said rotor shaft,

a pin in said piston, and a connecting rod con nected at one end to said pin and at the other end to said bearing, said pin, rod and bearing having intercommunicating passages for receiving lubricating liquid from said aperture in said cylinder to lubricate said eccentric bearing.

6. A compressor unit of the character described comprising a hermetically sealed casing, an electric motormounted in the bottom of said casing and including a rotor shaft journaled in the casing to be rotated about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, at least one fluid-compression cylinder in said casing above said liquid level, a piston reciprocable in said cylinder, eccentric means connecting between said rotor shaft and said piston for reciprocating the same, a bottom chamber in said casing below said liquid level, a screw extension on said rotor shaft rotatably received in said bottom chamber, an upper.

chamber in said casing above said liquid level, a passage through said rotor shaft communicating acUacent the upper and lower ends thereof with said upper and lower chambers, respectively, inlet means from said bath of lubricating liquid to said all bottom chamber above the lower end of said passage in the rotor shaft, said screw extension upon rotation of said rotor shaft by the motor in one direction being operable to force liquid from said bath upwardly from said bottom chamber through said passage and conduit means for supplying lubricating liquid from said passage to said cylinder and piston.

7; A compressor unit of the character described comprising a casing, power means within said casing including a member rotatably driven about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, a mechanism on said casing above the liquid level of said bath and driven by said power means, a bottom chamber in said casing below said liquid level, an upper chamber in said casing above said liquid level, a passage through said member communicating adjacent the upper and lower end thereof with said upper and lower chambers respectively, in-

let means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in said member, elements on the lower end of said member within said bottom chamber operable upon rotation of said member in one direction by the power means to compress lubricating liquid received within said bottom chamber through said inlet means, said compressed liquid thereby being forced upwardly through said passage and into said upper chamber, and conduit means for supplying compressed liquid from said upper chamber to said mechanism.

8. A compressor unit of the character described comprising a casing, power means within said casing including a member rotatably driven about a vertical axis, said casing having in the bottom thereof a bath of lubricating liquid, a mechanism in said casing above the liquid level of said bath and driven by said power means, means comprising a bottom chamber in said casing below said liquid level, a passage through said member communicating with said bottom chamber and extending to adjacent the upper end thereof, inlet means from said bath of lubricating liquid to said bottom chamber above the lower end of said passage in said member, elements on the lower end of said member receivable within said bottom chamber and being operable upon rotation of said member in one direction by the power means to compress lubricating liquid received within said bottom chamber through said inlet means, said compressed liquid thereby being forced upwardly through said passage, and conduit means .for supplying said compressed liquid from said passage to said mechanism.

, JOHN R. MANGAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,964,415 Van Deventer June 26, 1934 2,093,811 Kucher Sept. 21, 1937 2,125,645 Money Aug. -2, 1938 2,228,364 Philipp Jan. 14, 1941 

